/**
 * N-gram extraction utilities for language detection
 */
import type { NgramCounts, TermFrequencies } from '../types';
/**
 * Extract character n-grams from text
 * @param text - Input text
 * @param minN - Minimum n-gram size (default: 2)
 * @param maxN - Maximum n-gram size (default: 4)
 * @returns Array of n-grams
 */
export declare function extractNgrams(text: string, minN?: number, maxN?: number): string[];
/**
 * Count n-gram frequencies
 * @param ngrams - Array of n-grams
 * @returns Frequency counts
 */
export declare function countNgrams(ngrams: string[]): NgramCounts;
/**
 * Get term frequency (TF) for n-grams
 * @param text - Input text
 * @param minN - Minimum n-gram size
 * @param maxN - Maximum n-gram size
 * @returns Term frequencies
 */
export declare function getTermFrequencies(text: string, minN?: number, maxN?: number): TermFrequencies;
//# sourceMappingURL=ngram-extractor.d.ts.map